Investigation of simultaneous adsorption of SO2 and NO on γ-alumina at low temperature using DRIFTS

Xie, You; Chen, Ying; Ma, Yugang; Jin, Zhenglai

doi:10.1016/j.jhazmat.2011.08.032

Cited by 23 publications

(18 citation statements)

References 21 publications

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“…Previous studies about the interaction of NO 2 and SO 2 in solution proposed that the initial step involves the formation of an addition complex [SO 3 –NO 2 ] . This species could further undergo a subsequent reaction with NO 2 to produce a long lived intermediate [NO 2 –SO 3 –NO 2 ].…”

Section: Results and Discussionmentioning

confidence: 99%

“…The oxidation of NO to NO 2 is also a key step both in the NOx reduction technologies and the nitric acid production. − For example, the NH 3 -SCR reaction rate can be greatly enhanced if a fraction of NO is converted to NO 2 , and the increase of the NO 2 content greatly improves the efficiency of the reduction catalysts and also decreases aging of the catalysts. , Supported catalysts (included noble metals and metal oxides) are widely used in the catalytic oxidation of NO. − However, these oxidation reactions are always conducted at high NO concentrations (up to hundreds ppm) and high temperature (about 423–723 K). − In contrast, it was found that when the NO concentration was low to the ppb level, the heterogeneous reaction of NO on atmospheric particles was slow and supposed to hardly happen. , Therefore, the heterogeneous conversion of NO to NO 2 in the atmospheric chemistry has always been neglected.…”

Section: Introductionmentioning

confidence: 99%

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Efficient Conversion of NO to NO₂ on SO₂-Aged MgO under Atmospheric Conditions

Liu

Wang

et al. 2020

Environ. Sci. Technol.

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The NO–NO2 cycle determines the formation of O3 and hence plays a critical role in the oxidizing capacity of troposphere. Traditional view concluded that the heterogeneous oxidation of NO to NO2 was negligible due to the weak reactivity of NO on aerosols, compared to the homogeneous oxidation process. However, the results here reported for the first time that SO2 can greatly promote the heterogeneous transformation of NO into NO2 and HONO on MgO particles under ambient conditions. The uptake coefficients of NO were increased by 2–3 orders of magnitudes on SO2-aged MgO, compared to the fresh sample. Based on spectroscopic characterization and density functional theory (DFT) calculations, the active sites for the adsorption and oxidation of NO were determined to be sulfates, where an intermediate [SO4–NO] complex was formed during the adsorption. The decomposition of this species led to the formation of NO2 and the change of sulfate configuration. The formed NO2 could further react with surface sulfite to form HONO and sulfate. The conversion of NO to NO2 and HONO on the SO2-aged MgO surface under ambient conditions contributes a new formation pathway of NO2 and HONO and could be quite helpful for understanding the source of atmospheric oxidizing capacity as well as the formation of air pollution complexes in polluted regions such as the northern China.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Efficient Conversion of NO to NO₂ on SO₂-Aged MgO under Atmospheric Conditions

Liu

Wang

et al. 2020

Environ. Sci. Technol.

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“…It is noted that the formation of nitrate species was promoted significantly by SO 2 on all mineral oxides. One possible reason can be the reoxidation of the produced nitrite in eq . , Especially with the aid of O 2 , the NO resulting from the eqs and would combine with nitrite species to form nitrate species, as shown below, …”

Section: Discussionmentioning

confidence: 99%

“…One possible reason can be the reoxidation of the produced nitrite in eq 2. 63,64 Especially with the aid of O 2 , the NO resulting from the eqs 4 and 6 would combine with nitrite species to form nitrate species, as shown below, 54 +…”

Section: Quantitative Analysis Of Surface Productsmentioning

confidence: 99%

Role of NH₃ in the Heterogeneous Formation of Secondary Inorganic Aerosols on Mineral Oxides

Yang

et al. 2018

J. Phys. Chem. A

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In this work, a relationship between the role of NH and the properties of mineral oxides (α-FeO, α-AlO, CaO, and MgO) in the evolution of NO, SO, and NH has been established. It was found that the promotion effect of NH was more favorable for the formation of NO (or SO) and NH on acidic α-FeO and α-AlO due to acid-base interactions between NO with NH or between SO and NH, while this effect was weaker on basic CaO and MgO possibly due to their basic nature. The acid-base interaction (NO/SO with NH) overpowered the redox reaction (SO with NO) on FeO owing to its unique redox chemistry. However, the opposite was found on basic CaO and MgO for the formation of SO and NO. Under equivalent concentration conditions, the two synergistic effects did not further strengthen on FeO, CaO and MgO due to a competition effect. In NH-rich situation, a synchronous increase of SO, NO, and NH occurred on FeO. On acidic AlO, the favorable adsorption of NH on the surface as well as the existence of NO with an oxidizing capability synergistically promoted the formation of SO, NO, and NH.

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“…In particular, weakly adsorbed NO were also observed at 1684 cm −1 . 6 NO was supposed to adsorb on the sites of positive charged alumina ions, 74 and then was catalytically oxidized to various nitrates and nitrites, 75 indicating that the pure γ-Al 2 O 3 promoted the NO adsorption on the catalyst surface followed by the formation of nitrates. At times, it could be found that the lineshape of pure γ-Al 2 O 3 were similar to that of Mn/γ-Al 2 O 3 in Fig.…”

Section: Resultsmentioning

confidence: 99%

Mn-based catalysts supported on γ-Al₂O₃, TiO₂ and MCM-41: a comparison for low-temperature NO oxidation with low ratio of O₃/NO

et al. 2021

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Investigation of simultaneous adsorption of SO2 and NO on γ-alumina at low temperature using DRIFTS

Cited by 23 publications

References 21 publications

Efficient Conversion of NO to NO₂ on SO₂-Aged MgO under Atmospheric Conditions

Efficient Conversion of NO to NO₂ on SO₂-Aged MgO under Atmospheric Conditions

Role of NH₃ in the Heterogeneous Formation of Secondary Inorganic Aerosols on Mineral Oxides

Mn-based catalysts supported on γ-Al₂O₃, TiO₂ and MCM-41: a comparison for low-temperature NO oxidation with low ratio of O₃/NO

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Investigation of simultaneous adsorption of SO2 and NO on γ-alumina at low temperature using DRIFTS

Cited by 23 publications

References 21 publications

Efficient Conversion of NO to NO2 on SO2-Aged MgO under Atmospheric Conditions

Efficient Conversion of NO to NO2 on SO2-Aged MgO under Atmospheric Conditions

Role of NH3 in the Heterogeneous Formation of Secondary Inorganic Aerosols on Mineral Oxides

Mn-based catalysts supported on γ-Al2O3, TiO2 and MCM-41: a comparison for low-temperature NO oxidation with low ratio of O3/NO

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Efficient Conversion of NO to NO₂ on SO₂-Aged MgO under Atmospheric Conditions

Efficient Conversion of NO to NO₂ on SO₂-Aged MgO under Atmospheric Conditions

Role of NH₃ in the Heterogeneous Formation of Secondary Inorganic Aerosols on Mineral Oxides

Mn-based catalysts supported on γ-Al₂O₃, TiO₂ and MCM-41: a comparison for low-temperature NO oxidation with low ratio of O₃/NO